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US4319008A
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Polyether admixture and semi-permeable membranes comprised thereof
Assignee: Rhone Poulenc Industries SA
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Filing: 1979-05-03
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Granted: 1982-03-09
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Expires: 1999-05-03
Abstract
Abstract Semi-permeable, e.g., ultrafiltration membranes are shaped from a solvent solution of an admixture of at least one polyether comprising recurring units of the structural formula: --O--Ar--O--CH.sub.2 --CHOH--CH.sub.2 -- (I) and at least one polyether comprising recurring units of the structural formula: --O--E--R--E'.sub.m O--G--SO.sub.2 --G'-- (II) wherein Ar, E, E', G and G' are divalent aromatic radicals, m is an integer, and R is a valence bond or a member selected from the group comprising --CO--, --O--, --SO 2 -- and a divalent hydrocarbon.
Inventors
- 👤 Xavier Marze
- 👤 Michel Minfray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:01
CPC Classifications
C; C08; C08L; C08L71/00; B; B01; B01D; B01D71/00; B01D71/06; B01D71/52; B01D71/66; B01D71/68; C08L81/00; C08L81/06; Y; Y10; Y10S; Y10S525/00; Y10S525/93
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
104 words
A semi-permeable membrane comprising a composition of matter comprising an admixture of at least one polyether consisting essentially of recurring units of the structural formula: --O--Ar--O--CH.sub.2 --CHOH--CH.sub.2 -- (I) and at least one polyether consisting essentially of recurring units of the structural formula: --O--E--R--E'].sub.m --O--G--SO.sub.2 --G'-- (II) in which formulae Ar is a divalent aromatic radical in which the free valencies are borne by nuclear carbons; m is a lower integer; E, E', G and G' are divalent aromatic radicals, and R is a valence bond or a radical selected from the group consisting of --CO--, --O--, --SO 2 -- and divalent hydrocarbon radicals.
Claim 2
Dependent Claim
104 words
A semi-permeable membrane comprising a composition of matter comprising an admixture of at least one polyether consisting essentially of recurring units of the structural formula: --O--Ar--O--CH.sub.2 --CHOH--CH.sub.2 -- (I) and at least one polyether consisting essentially of recurring units of the structural formula: --O--E--R--E'].sub.m --O--G--SO.sub.2 --G'-- (II) in which formulae Ar is a divalent aromatic radical in which the free valencies are borne by nuclear carbons; m is a lower integer; E, E', G and G' are divalent aromatic radicals, and R is a valence bond or a radical selected from the group consisting of --CO--, --O--, --SO 2 -- and divalent hydrocarbon radicals.
Claim 3
Dependent Claim
53 words
A semi-permeable membrane in accordance with claim 1 comprising a composition of matter wherein Ar has the structural formula: --C 6 H 4 -- R--C 6 H 4 ] m ; m is 0, 1 or 2; and R is selected from the group consisting of lower alkylene, lower alkylidene and lower cycloalkylene.
Claim 4
Dependent Claim
23 words
A semi-permeable membrane in accordance with claim 2 comprising a composition of matter wherein either or both of E and E' are sulfonated.
Claim 5
Dependent Claim
56 words
A semi-permeable membrane in accordance with claim 3 comprising a composition of matter wherein either or both of E and E' comprise substituents having the structural formula: --SO 3 .sup.⊖.(1M n ⊕ /n), wherein M is hydrogen, NH 4 ⊕ or an alkali or alkaline earth metal of valency n, and n is 1 or 2.
Claim 6
Dependent Claim
25 words
A semi-permeable membrane in accordance with claim 2, 3 or 4 comprising a composition of matter wherein E, E', G and G' are phenylene radicals.
Claim 7
Dependent Claim
33 words
A semi-permeable membrane in accordance with claim 4 or 1 comprising a composition of matter containing from 15 to 85% by weight of a polyether comprising recurring units of the structural formula (II).
Claim 8
Dependent Claim
31 words
A semi-permeable membrane in accordance with claim 6 comprising a composition of matter containing from 30 to 75% by weight of a polyether comprising recurring units of the structural formula (II).
Claim 9
Dependent Claim
30 words
A semi-permeable membrane in accordance with claim 2, 4 or 1 comprising a composition of matter wherein each polyether has a weight average molecular weight of between 10,000 and 60,000.
Claim 10
Dependent Claim
27 words
A semi-permeable membrane in accordance with claim 8 comprising a composition of matter wherein each polyether has a weight average molecular weight of between 20,000 and 50,000.
Claim 11
Dependent Claim
29 words
A semi-permeable membrane in accordance with claim 4 comprising a composition of matter wherein the content of the sulfonic substituents in the polyether (II) is less than 1,500 milliequivalents/kg.
Claim 12
Dependent Claim
25 words
A semi-permeable membrane in accordance with claim 10 comprising a composition of matter wherein the content of the sulfonic substituents is less than 1,000 milliequivalents/kg.
Claim 13
Dependent Claim
28 words
A semi-permeable membrane in accordance with claim 2 or 1 comprising a composition of matter wherein each polyether consists essentially of its respective recurring units (I) and (II).
Claim 14
Dependent Claim
14 words
A semi-permeable membrane as defined by claim 1, the same being an asymmetric membrane.
Claim 15
Dependent Claim
122 words
A process for the fabrication of a semi-permeable membrane, comprising casting onto a support a solvent solution of a composition of matter comprising an admixture of at least one polyether consisting essentially of recurring units of the structural formula: --0--Ar--0--CH.sub.2 --CHOH--CH.sub.2 -- (I) and at least one polyether consisting essentially of the structural formula: --O--E--R--E'].sub.m O--G--SO.sub.2 --G'-- (II) in which formulae Ar is a divalent aromatic radical in which the free valencies are borne by nuclear carbons; m is a lower integer; E, E', G and G' are divalent aromatic radicals, and R is a valence bond or a radical selected from the group consisting of --CO--, --O--, --SO 2 -- and divalent hydrocarbon radicals, and thence coagulating same into membrane form.
Claim 16
Dependent Claim
122 words
A process for the fabrication of a semi-permeable membrane, comprising casting onto a support a solvent solution of a composition of matter comprising an admixture of at least one polyether consisting essentially of recurring units of the structural formula: --0--Ar--0--CH.sub.2 --CHOH--CH.sub.2 -- (I) and at least one polyether consisting essentially of the structural formula: --O--E--R--E'].sub.m O--G--SO.sub.2 --G'-- (II) in which formulae Ar is a divalent aromatic radical in which the free valencies are borne by nuclear carbons; m is a lower integer; E, E', G and G' are divalent aromatic radicals, and R is a valence bond or a radical selected from the group consisting of --CO--, --O--, --SO 2 -- and divalent hydrocarbon radicals, and thence coagulating same into membrane form.
Claim 17
Dependent Claim
54 words
The process as defined by claim 14 wherein said solvent solution comprises a composition of matter wherein Ar has the structural formula: --C 6 H 4 --R--C 6 H 4 ] m ; m is 0, 1 or 2; and is selected from the group consisting of lower alkylene, lower alkylidene and lower cycloalkylene.
Claim 18
Dependent Claim
26 words
The process as defined by claim 15 wherein said solvent solution comprises a composition of matter wherein either or both of E and E' are sulfonated.
Claim 19
Dependent Claim
59 words
The process as defined by claim 16 wherein said solvent solution comprises a composition of matter wherein either or both of E and E' comprise substituents having the structural formula: --SO 3 .sup.⊖.(1M n ⊕ /n), wherein M is hydrogen, NH 4 ⊕ or an alkali or alkaline earth metal of valency n, and n is 1 or 2.
Claim 20
Dependent Claim
18 words
The process as defined by claim 14, further comprising subjecting the resultant membrane to an aqueous heat treatment.
Claim 21
Dependent Claim
23 words
The process as defined by claim 14, the coagulating being by means of water at a temperature of between 1° and 60° C.
Claim 22
Dependent Claim
20 words
The process as defined by claim 19 wherein the temperature of the coagulating bath is between 15° and 50° C.
Claim 23
Dependent Claim
28 words
The process as defined by claim 14, 15, 16, or 17 wherein the concentration of the polyether admixture in the solvent solution is greater than 20% by weight.
Claim 24
Dependent Claim
18 words
The process as defined by claim 21 wherein said concentration is between about 22% and 30% by weight.
Claim 25
Dependent Claim
16 words
The process as defined by claim 21 wherein the solvent of said solvent solution comprises N-methylpyrrolidone.
Claim 26
Dependent Claim
18 words
The process as defined by claim 21 wherein the solution comprises from 0.05 to 2% by weight water.
Claim 27
Dependent Claim
18 words
The process as defined by claim 24 wherein the solution comprises from 0.1 to 1% by weight water.
Claim 28
Dependent Claim
9 words
The membrane obtained by the process of claim 21.
Claim 29
Dependent Claim
9 words
The membrane obtained by the process of claim 22.
Claim 30
Dependent Claim
9 words
The membrane obtained by the process of claim 23.
Claim 31
Dependent Claim
9 words
The membrane obtained by the process of claim 24.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |